PROBLEM TO BE SOLVED: To provide a cleaning system of a fish preserve for active squids with which even impurities difficult to be removed by normal filter filtration can be removed in a circulating fish preserve.SOLUTION: A cleaning system of a fish preserve for active squids includes: an oxygen supply unit 25 for taking air in water and increasing a dissolved oxygen concentration； a hydrostatic part 28 with the water passing the oxygen supply unit 25 introduced therein； a treated water supply port 29 for supplying the water passing the hydrostatic part 28 to the fish preserve； a bubble flow path 30 provided in the upper part of the hydrostatic part 28 and passing the bubble generated in the oxygen supply unit 25； and a bubble discharge port 31 for discharging the bubble passing the bubble flow path 30 to the outside.SELECTED DRAWING: Figure 3
